之前Xbox 720的CPU技术细节遭曝光，而现在这款新一代主机的GPU部分也被曝光了。Xbox 720将采用x64架构CPU，8个核心运行频率为1.6Ghz。显示部分将采用定制的Direct3D 11 Durango GPU，具体技术细节如下图： Compute Shader cores - 12 Instruction issue rate - 12 SCs * 4 SIMDs * 16 threads/clock = 768 ops/clock FLOPs 768 ops/clock * (1 mul + 1 add) * 800 MHz = 1.2 TFLOPs Interpolation ( 768 ops/clock / 2 ops ) * 800 MHz = 307.2 Gfloat/sec Geometry Triangle rate 2 tri/clock * 800 MHz = 1.6 Gtri/sec Vertex rate 2 vert/clock * 800 MHz = 1.6 Gvert/sec Vertex/buffer fetch rate (4 bytes) 4 elements/clock * 12 SCs * 800 MHz = 38.4 Gelement/sec Vertex/Buffer data rate from cache 38.4 Gelements/sec * 4 bytes = 153.6 GB/sec Memory Peak throughput from main RAM 68 GB/sec Peak throughput from ESRAM 128 bytes/clock * 800 MHz = 102.4 GB/sec ESRAM size 32 MB GSM size 64 KB LSM size 12 SCs * 64 KB = 768 KB L2 cache size 4 x 128 KB = 512 KB (shared) Texture Bilinear fetch rate (4 bytes) 4 fetches/clock * 12 SCs * 800 MHz = 38.4 Gtexels/sec Bilinear data rate from cache 38.4 Gtexels/sec * 4 bytes = 153.6 GB/sec L1 cache size 16 KB/SC * 12 SCs = 192 KB (nonshared) Output Color/depth blocks 4 Pixel clear rate 1 8×8 tile/clock * 4 DBs * 800 MHz = 204.8 Gpixel/sec Pixel hierarchical Z cull rate 1 8×8 tile/clock * 4 DBs * 800 MHz = 204.8 Gpixel/sec Sample Z cull rate 16 /clock * 4 DBs * 800 MHz = 51.2 Gsample/sec Pixel emit rate 4 /clock * 4 DBs * 800 MHz = 12.8 Gpixel/sec Pixel resolve rate 4 /clock * 4 DBs * 800 MHz = 12.8 Gpixel/sec
